Portable Restroom FAQs

  1. Does the Siphon fit onto all portable stacks?
    There are two versions of siphon: The Stack Mount fits a stack opening of 4” inside Diameter. It also fits to the outside of a 3” pipe (which measure in at 3.5” outside), and to the outside of a 2” pipe (which measure in at 2.5” outside). The flanged roof mount version seals to a roof, it has a 5.5” flange diameter.
  2. Can it be mounted on an angle or does it matter if the cubicle is not level?
    The angle makes no difference to the Siphon’s operation.
  3. How does the 360 Siphon work?
    Its aerodynamically engineered, it has no wind resistance; it channels wind into is vortex where it creates a low pressure at the exhaust port. The lid is a complex series of shapes that has taken 3 years of design and field testing.

    The siphon cannot fail, it’s the worlds only non-mechanical air check valve that eliminates stack down drafts simultaneously creating a low pressure regardless of wind direction or velocity.
    The siphon does two important things to a sewer system. When ever there is a wind, it is drawing off odors and gasses out of the tank, less chance of fume buildup. It also places a low pressure in the tank when there is a breeze, making it highly unlikely for odors to drift into the cubicle.
  4. What if there is no wind?
    If there is no wind there will never be a problem, air pressure differential will not exist, so there is no force pushing the fumes into the cubicle. Not only that, a minimum amount of tank fumes will be present due to earlier winds.
  5. Does the 2.5” opening and bug screen on the siphon reduce the air flow or venting of a 4” stack?
    In a perfect situation with a steady moderate wind coming straight in at 90 degrees to the stack, there would be approximately 10% airflow reduction. Unfortunately, gusts and air turbulence is a lot more common, they do nothing but blow air down the stack. Light winds do basically nothing. With the siphon, all these wind conditions are now drawing up gasses, while inhibiting that odor causing down draft. The airflow gain in an everyday situation outweighs the odd chance of the perfect breeze hitting the stack just at right angles.
  6. Why do portables sometimes smell and at times, don’t?
    Assuming maintenance and use is the same, the only remaining variable is venting.
    An open stack is very vulnerable to wind conditions as previously mentioned. Depending on the physical location of the portable in relation to the wind direction, it could smell worse (if the wind hits obstacles prior to hitting the stack), or not at all (if the wind was not obstructed, nor gusty and hit the stack square on). In some cases it might not smell without wind and some cases with wind. The purpose of the Siphon is to utilize all these conditions to insure the least possible chance of odors or fumes.